SIDE-ACTIVATED MODULAR DRILL

Abstract

Rotating cutting tool, including: a shaft (12); and a replaceable cutting tip (14); wherein the shaft (12) includes a pocket (428) which receives the replaceable cutting tip (14) via a press fit; This pocket (428) comprises two centering wall sections (432) which, when viewed along a central longitudinal axis (A) of the shaft (12), are aligned to each other at a first angle (B), the first angle (B) being greater than zero; and an adjusting screw (840) which is mounted in the shaft (12) and is aligned at a second angle (E) to a plane transverse to the central longitudinal axis (A) in order to axially move the replaceable cutting tip (14) from a starting position to a clamping position, and to axially move the replaceable cutting tip (14) from the clamping position to an ejection position, wherein, in order to effect a displacement of the replaceable cutting insert (14) between the starting position and the clamping position: a first surface (948) of the adjusting screw (840) touches a second surface (950) of the replaceable cutting tip (14) via a first contact surface (958); the adjusting screw (840) moves in a first direction; and the replaceable cutting tip (14) then moves axially from the starting position into the clamping position, in which the adjusting screw (840) touches the replaceable cutting tip (14) via a second contact surface (960) which is larger than the first contact surface (958), wherein, in order to cause a displacement of the replaceable cutting tip (14) between the clamping position and the ejection position: a third surface (964) on the adjusting screw (840) touches a fourth surface (952) on the replaceable cutting tip (14) via a third contact surface (962); the adjusting screw (840) shifts in a second direction opposite to the first direction; and the replaceable cutting tip (14) then moves axially from the clamping position to the ejection position and where frictional forces from the press fit are overcome when the replaceable cutting tip (14) is moved from the clamping position to the ejection position.

Description

BACKGROUND

[0001] A wide variety of drills with interchangeable cutting tips (or inserts) are known in the prior art. Illustrative examples can be attributed to US 2006 007 297 6 A1, US 2008 002 580 6 A1, and US 2012 000 305 6 A1. Such drills incorporate interchangeable cutting heads mounted on shanks. Typically, though not exclusively, the cutting heads and shanks may exhibit continuous and complementary configurations as fluted drills. Each shank usually includes a structure for holding and rotating an associated cutting head, while the associated cutting head has a complementary structure for being held and rotated by the shank.

[0002] Furthermore, DE 803 143 B discloses a countersinking tool designed in such a way that the countersink can be inserted into a corresponding inner cone of the holder by means of a short cone, wherein the countersink is provided with a bore at the base of which a retaining screw is arranged.

[0003] US 5,407,308 A discloses a tool holder coupling device for attaching a tool holder to a machine spindle, showing a tool holder having a support section and a drawbolt.

[0004] US Patent 2002 / 0168239 A1 discloses a cutting tool with an interchangeable cutting head and a tool body with a common longitudinal axis and matching circumferential surfaces. The cutting head has a cutting section forming a front end, a guide section forming a rear end, and a cutting head mounting section that is arranged at the rear end of the cutting head.

[0005] Challenges related to deformation and failure during the service life of a drill bit often arise due to (at least partially) a concentration of stresses exerted on the shank's holding and drive structure during normal operation. This can excessively limit the useful life of the drill bit; therefore, relevant improvements and modifications are continuously sought to help mitigate the effects of known problems and limitations.

[0006] The object of the invention is to provide a rotating cutting tool that has a longer service life. A further object of the invention is to provide a shank for a rotating cutting tool with a longer service life. SUMMARY

[0007] The problem is solved by a rotating cutting tool according to claim 1, by a rotating cutting tool according to claim 9, and by a shank for a rotating cutting tool according to claim 16.

[0008] In summary, from one point of view of the invention, a rotating cutting tool comprises: a shank; and an interchangeable cutting tip; wherein the shank includes a pocket which receives the interchangeable cutting tip via a press fit; this pocket includes two centering wall sections which, when viewed along a central longitudinal axis of the shank, are aligned at a first angle to each other, wherein the first angle is greater than zero;and an adjusting screw mounted in the shaft and oriented at a second angle to a plane transverse to the central longitudinal axis to axially displace the replaceable cutting tip from a starting position to a clamping position, and to axially displace the replaceable cutting tip from the clamping position to an ejection position, wherein, in order to effect a displacement of the replaceable cutting insert between the starting position and the clamping position: a first surface of the adjusting screw touches a second surface of the replaceable cutting insert via a first contact surface; the adjusting screw moves in a first direction;and the replaceable cutting insert then moves axially from the starting position to the clamping position, in which the adjusting screw contacts the replaceable cutting tip via a second contact surface that is larger than the first contact surface, wherein, in order to cause a displacement of the replaceable cutting tip between the clamping position and the ejection position: a third surface on the adjusting screw contacts a fourth surface on the replaceable cutting insert via a third contact surface; the adjusting screw displaces in a second direction opposite to the first direction; and the replaceable cutting insert then moves axially from the clamping position to the ejection position, and wherein frictional forces from the interference fit are overcome when the replaceable cutting tip is displaced from the clamping position to the ejection position.

[0009] Another aspect of the invention provides a shank for a rotating cutting tool, wherein the shank comprises: a pocket that receives an interchangeable cutting tip via an interference fit; wherein the pocket comprises two centering wall sections which, when viewed along a central longitudinal axis of the shank, are oriented at a non-zero angle to each other; an adjusting screw mounted in the shank and oriented at a second angle to a plane transverse to the central longitudinal axis in order to axially displace the interchangeable cutting tip from a starting position to a clamping position, and to axially displace the interchangeable cutting tip from the clamping position to an ejection position; a pair of torque transmission walls for rotatably driving an interchangeable cutting insert about the central longitudinal axis of the shank;wherein the torque transmission walls are each aligned at a predetermined angle with respect to a defining dimension of at least one of the centering wall sections, the third angle being between about 75 degrees and about 120 degrees; a channel arranged in the shaft; and a wrench that can be inserted into the channel for sliding and rotational movements within the channel;wherein the wrench, when rotated about a longitudinal axis of the wrench in the channel, causes a displacement of the replaceable cutting tip between the clamping position and the ejection position, wherein the wrench includes a protrusion which, when rotated by the wrench in the channel, displaces the replaceable cutting tip between the clamping position and the ejection position, and wherein the adjusting screw includes a recess which receives the protrusion of the wrench to allow rotation of the adjusting screw driven by the wrench.

[0010] For a better understanding of exemplary embodiments of the invention together with other and further features and advantages thereof, reference is made to the following description in conjunction with the accompanying drawings, and the scope of the claimed embodiments of the invention is set out in the accompanying patent claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a side view of a rotating cutting tool that includes a shaft and an interchangeable cutting insert. Fig. Figure 2 shows a side view of a shaft and cutting insert in a cutting tool 110. Fig. Figure 3 shows a top view of a conventional cutting tool with a shank and a cutting insert installed in it. Fig. Figure 4 shows a top view of a shaft. Fig. Figure 5 shows a side view of the shaft made of Fig. 4. Fig. Figure 6 shows a top view of a shaft and a cutting insert installed in it. Fig. Figure 7A shows a side view of a cutting insert. Fig. Figure 7B shows a top view of the cutting insert of Fig. 7A. Fig. 7C shows an axial section through the line 7C-7C in Fig. 7B is going. Fig. Figure 7D shows a side view of a cutting insert according to at least one different embodiment. Fig. Figure 8 shows essentially the same elevation as Fig. 7A, but also shows an angled adjusting screw. Fig. Figure 9A schematically illustrates, in an elevation cross-sectional view, a cutting insert and an adjusting screw in a starting position for assembly. Fig. Figure 9B schematically illustrates the cutting insert and an adjusting screw of Fig. 9A, but in a “stuck” position. Fig. Figure 9C schematically illustrates the cutting insert and an adjusting screw of Fig. 9A, but in a position set for "ejection" or disassembly. Fig. Figure 10 shows a top view of a shaft according to at least one different embodiment, including a wrench for moving a cutting insert. Fig. Figure 11A shows a front elevation of a shaft and a cutting insert in a clamping position, according to at least one different embodiment. Fig. Figure 11B shows an axial section defined by the line 11B-11B in Fig. 11A is working. Fig. Figure 12A shows a side view of a shaft and cutting insert according to at least one different embodiment similar to that shown in Fig. 11A, however with wrench 1270 inserted and in a position set for 'ejection' or disassembly. Fig. Figure 12B shows a rear elevation of the shaft and cutting insert, which is in Fig. 12A will be shown. Fig. 12C shows an axial section defined by the line 12C-12C in Fig. 12B is working. Fig. Figure 12D shows an axial section defined by the line 12D-12D in Fig. 12A works. DETAILED DESCRIPTION

[0011] It is easy to understand that the components of the embodiments of the invention, as generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations in addition to the exemplary embodiments described. Therefore, the following more detailed description of the embodiments of the invention, as represented in the figures, is not intended as a limitation of the claimed scope of the embodiments of the invention, but merely as an illustration of exemplary embodiments of the invention.

[0012] References in this description to "an embodiment" (or the like) mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, appearances of the expression "in an embodiment" or the like at different points in this description do not necessarily refer to the same embodiment.

[0013] Furthermore, the described features, structures, or characteristics can be combined in any suitable way in at least one embodiment. Numerous specific details are provided in the following description to offer a thorough understanding of embodiments of the disclosure. However, a person skilled in the relevant field will readily recognize that embodiments of the invention can be practiced without at least one of these specific details or with other methods, components, materials, etc. In other cases, generally known structures, materials, or processes are not shown or described in detail to avoid obscuring aspects of the invention.

[0014] The description now turns to the figures. The embodiments of the invention shown are best understood by reference to the figures. The following description is intended only as an example and simply illustrates certain selected embodiments of the invention as claimed herein. To facilitate easier reference, the following will be used as we progress from Fig. 1 and up Fig. 12D a reference sign increased by a multiple of 100 to indicate an substantially similar or analogous component or element in relation to at least one component or element shown in one or more prior figures of Fig. 1-12D can be found.

[0015] Fig. Figure 1 shows a rotary cutting tool 10 in the form of a drill bit with a shank 12 and a cutting insert 14, both manufactured as separate parts. The cutting insert 14 can be detachably and interchangeably attached to or installed on the shank 12. Likewise, the rotating cutting tool for performing a rotary cutting operation on a workpiece can also be designed as a milling or reaming tool for drilling a hole. For purely illustrative purposes, the following is shown in Figure 1: Fig. The cutting tool 10 shown is a twist drill which includes a pair of helical grooves 16 arranged diametrically opposite each other along the sides of the drill. Each groove 16 extends over the shank 12 and the cutting insert 14, the latter also including a drill point 17.

[0016] In general, a central longitudinal axis A is defined by the cutting tool 10 (common to both the shank 12 and the cutting insert 14), about which the cutting tool 10 rotates during operation. A “cutting insert” may alternatively be designated, herein and elsewhere, by one of a variety of other suitable terms, such as “tip”, “insert”, “head”, “cutting point”, or “cutting insert”.

[0017] It should be noted that each groove has 16, as shown in Fig. Figure 1 shows sections that are arranged identically in both the shank 12 and the cutting insert 16. Therefore, when the cutting insert 14 is installed on the shank 12, the corresponding groove sections in the cutting insert 14 and shank 12 will align identically to form the grooves 16, which are generally continuous and straight. Although two grooves 16 are shown here, it is understood that any number of grooves (including just one) is possible.

[0018] Fig. Figure 2 shows a side view of a shaft 112 and cutting insert 114 in a cutting tool 110 according to at least one embodiment. As shown, the cutting insert 114 is fixedly positioned at an axial end of the shaft 112 in preparation for operation.

[0019] Further details of a shaft and a cutting insert according to at least one embodiment are better understood according to the following discussion.

[0020] When depicting Fig. In Figure 2, the cutting head 114 is revealed at the leading end of the cutting tool 110. A “leading end,” defined here for semantic purposes, is the end that engages with a workpiece during cutting. During cutting operations, the cutting tool 110 is rotated and gradually advanced into the workpiece as the cutting progresses. The end of the cutting insert opposite the leading end can be referred to as the “trailing end.” The terms “leading end” and “trailing end” are semantic constructs that apply equally to the shank 12 and the cutting head 14, as they express a directional orientation with respect to the longitudinal axis A rather than a specific structure.

[0021] By general comparison according to at least one embodiment, offers Fig. Figure 3 shows a top view of a conventional cutting tool 210 with a shank and a cutting insert installed therein. As shown, the insert 214 is mounted at the axial end of the shank 212 to engage during a cutting operation when the cutting tool 210 is rotated about its longitudinal axis A in a counterclockwise direction C (when viewed with respect to Fig. 3.) The tool 210 contains a pair of grooves 216, which are defined by the relative positioning of the shank 212 and the insert 214. The insert 214 is received in a pocket of the shank 212 via an interference fit.

[0022] The cutting insert 214 contains a pair of cutting edges 220, each arranged next to a corresponding groove 216. As can be understood, the cutting edges 220 cut into a workpiece, while the drill 210 rotates in the cutting direction C when it engages a workpiece. For the purpose of rotating the cutting insert 214, it contains two drive surfaces 222, which are dimensioned and arranged such that compatible torque transmission walls 224 of the shank 212 engage with them. The drive surfaces 222 and the torque transmission walls 224 are each aligned along a plane that is substantially parallel with respect to the longitudinal axis A. Although not explicitly shown here, the rotation of the entire cutting tool 210 can be actuated by a separate drive element, such as a hand drill, drilling machine, or machine tool, thereby rotating the shank 212.As such, the walls 224 and drive surfaces 222 are located in the . Fig. The conventional arrangement shown in Figure 3 is oriented equally in one direction (as shown in the figure), resulting in a torque transmission force that is essentially perpendicular to the walls of the aforementioned pocket (which receives the insert 214 via the press fit). It has been found that this torque transmission force can cause considerable stresses in critical regions of the shaft 212 due to bending, thus representing a significant area for improvement. Regarding centering and stability, to the extent that the insert 214 is fitted with a press fit for centering and stability purposes, it is understood that the elastic deformation of the walls 224 generates stresses in the same areas as stresses caused by torque transmission.As will be shown in more detail below, arrangements for a drill are discussed in detail herein, advantageously providing an interference fit between an insert and a shank, with a high torque transmission capability achieved by positioning the drive walls at a smaller angle (than in . Fig. 3 (the case is) is achieved with regard to pocket centering walls.

[0023] Fig. Figure 4 shows a top view of a shaft 412 according to at least one embodiment. A pair of groove sections 416b are defined in the shaft and configured to engage with compatible groove sections of a cutting insert. The shaft 412 includes a pocket 428 for receiving a cutting insert; the main elements of the latter include two centering walls 432 connected to each other by a base 430. The base 430 may be oriented transversely with respect to the central longitudinal axis A. Any or all of the central base sections 430 and centering walls 432 serve as bearing surfaces that contact the cutting insert when the cutting insert is installed in the shaft 412. As shown, a central (blind) hole or opening 426 is arranged centrally in the base 430 (around the axis A) and configured to receive a centering pin of a cutting insert.

[0024] In a manner that will be better understood below, the centering walls 432 deform to receive compatible sections of a cutting insert via an interference fit. Preferably, the centering walls 432 (or at least a section thereof) are each inclined at an angle with respect to the central longitudinal axis A, inclined away from axis A as it progresses towards a front end of the shank 412. According to at least one embodiment, which is described in Fig. As shown in Figure 4, the centering walls 432 are essentially straight (while, as mentioned, they are inclined) and parallel to each other when viewed in a given single horizontal plane perpendicular to axis A. (It is understood here, however, that by extension the centering walls 432 would also be inclined perpendicular to axis A with respect to this plane.)

[0025] According to at least one differing embodiment, the centering walls 432 can each be curved when viewed in a given single horizontal plane perpendicular to axis A. In such variants, merely as an illustrative and non-limiting example, each wall 432 can be oriented along an arc that runs substantially parallel to a circumference of the larger shaft 412. Accordingly, such walls 432, taken together, would generally trace a frustoconical shape, narrowing as a close-range function (in an axial direction) towards the receiving base 430.

[0026] In Fig. Figure 4 also shows torque transmission walls 424, which, in contrast to the conventional example of Fig. 3, designed and arranged to transmit a force to compatible drive surfaces of a cutting insert in a direction that is substantially parallel to the centering walls 432. This represents a significant improvement over the conventional example of Fig. 3 by significantly reducing stresses generated in each of several critical areas of the pocket 428, of other sections of the shaft 412 and of a cutting insert mounted therein.

[0027] Further advantages can be found in connection with the insertion of a cutting insert into pocket 428. Here, to the extent that the centering walls 432 ultimately deflect radially outwards with respect to axis A, such a deflection can be transferred to the torque transmission walls 424. As a result, the torque transmission walls deflect almost parallel to, or very close to, a radial direction with respect to axis A, essentially along their own horizontal dimension (that is, their dimension that lies perpendicular to axis A). This serves to maintain direct contact with the drive surfaces of the clamped cutting insert. In contrast, with a conventional arrangement such as the one in Fig. As shown in 3, the torque transmission walls 224 shown herein deflect more or less in a radial direction with respect to axis A, thereby reducing direct contact with the drive surfaces (such as those shown in 222). Fig. 3A shown) the cutting insert is endangered.

[0028] In the Fig. In the arrangement shown in Figure 4, the torque transmission walls 424 are aligned parallel with respect to the central longitudinal axis A when viewed in a generally longitudinal direction. In at least one alternative embodiment, the walls 424 can be inclined with respect to the central longitudinal axis A (e.g., at an angle between approximately 0 and approximately 10 degrees, preferably between approximately 2 and approximately 6 degrees, and / or they can correspond to the inclination of the centering walls 432) in a direction opposite to the rotating cutting direction C of the shaft 412 towards the leading end of the shaft 412). (It is understood here that in such a variant, the torque transmission walls 424 would also be inclined with respect to a plane transverse to the central longitudinal axis.)) Shallow semi-cylindrical recesses 434 can each run along a base of each of the centering walls 432 and torque transmission walls 424; the recesses 434 can assist in reducing the stresses acting equally on the pocket 428 and a similar insert.

[0029] According to the aforementioned modified embodiment, it should be noted that if the walls 424 are inclined with respect to axis A, when an insert is first positioned in the pocket 428 prior to the clamping process, the centering walls 432 and corresponding surfaces on the insert will contact each other; a gap will exist between the insert and the pocket bottom 430 at this point. At the same time, another gap (albeit a significantly smaller one) exists at this point between drive surfaces of the insert (e.g., such as those described in the Fig. 7A and Fig. 7B shown drive surfaces 722 of the insert 714) and the torque transmission walls 424. In this way, when the insert is clamped and the centering walls 432 expand outwards, the torque transmission walls 424 and corresponding drive surfaces can contact the insert before any torque is applied to the insert (e.g., as may be applied in a subsequent drilling operation).

[0030] In general, with regard to various embodiments herein, it is understood that when an insert is fully clamped in a shaft (such as 412), this insert may touch the bottom of the pocket 430, or that there may indeed be a small gap between a lower portion of the main head section of the insert and the bottom 430. While various views herein do not expressly illustrate such a gap (e.g., for clarity of illustration), it should be understood and acknowledged that such a gap may be considered to exist according to one or more embodiments and / or variants.

[0031] Fig. Figure 5 shows a side view of shaft 412 of Fig. 4. As shown, the centering walls 432 can be symmetrical with respect to axis A and angled at a common angle B relative to each other. Angle B could be between approximately 3 and approximately 6 degrees, or alternatively, it could be defined such that it imparts an inclination of between approximately 1:20 and approximately 1:10 to each wall 432. It should be understood and recognized that, when installed, a cutting insert will initially sit on centering walls 432 at a distance from the pocket base 430 before it is fully clamped in the pocket 428. Accordingly, elastic deformation of the centering walls 432 occurs when the insert is pulled onto the base 430. (Further details regarding a clamping action, according to at least one embodiment, will be better understood from the description below.)

[0032] According to at least one embodiment, it can further be seen that with angled centering walls 432, as discussed above, a disturbance caused during the initial insertion of a cutting insert results in a relatively small displacement, which will then be required for fully clamping the insert within the pocket 428 and for ejecting the insert for removal. This is in clear contrast to conventional arrangements with straight centering walls (corresponding to axis A), which typically give rise to a relatively large displacement required for fully clamping an insert in a pocket and then for ejecting the insert.

[0033] According to at least one embodiment, as in Fig. Figure 5 shows that essentially the entirety of each centering wall 432, extending axially upward from the pocket bottom 430 to the front end of the shank 412, is inclined, as shown. According to at least one variant embodiment, a lower section of each centering wall 432 (i.e., a section axially closer to the pocket bottom 430) is either not inclined at all (i.e., it is parallel) with respect to axis A or inclined at a different angle with respect to axis A than an upper section of each centering wall 432. In such variants, the upper sections of the centering walls 432 can be assumed to assume the angle B, as explained above, and still represent surfaces that are initially contacted by an insert when the insert is received in the pocket 428.In such variants, preferably at least about 50 to 75 percent of the axial extent of each centering wall 432 is represented by an upper section which is angled to assume the angle B discussed above.

[0034] Fig. Figure 6 shows a top view of a shaft 612 and the cutting insert 614 installed therein according to at least one embodiment. As shown, the cutting insert 614 includes drive surfaces 622 which are oriented to be compatible with the torque transmission walls 624 of the shaft 612. Preferably, when viewed transversely with respect to axis A (as is actually the case in Fig. (as shown in Figure 6) the surfaces / walls 622 and 624 can be oriented such that a driving force is generally transmitted in a direction that is substantially parallel to the centering walls. As such, the surfaces / walls 622 and 624 can be oriented at an angle D with respect to the centering walls of the shaft 612 (as shown at Figure 432 in Figure 6). Fig. 4 and Fig. 5 are specified) and thus be aligned with a corresponding surface or side 623 of the insert 614. As an illustrative example, D could be between about 75 and about 120 degrees, or preferably between about 85 and about 100 degrees; preferably, D can be about 90 degrees. It is understood that preferably in this way a practical balance can be found in choosing the angle D, in which larger angles will tend to reduce stresses on the insert 614 and increase stresses on the pocket (defined by centering walls of the shank 612), while smaller angles will tend to reduce stresses on the pocket (of the shank 612) and increase stresses on the cutting insert 614. It is further understood that an arrangement such as that shown in Fig. 6 shown, in stark contrast to the one in Fig. Figure 3 shows where an angle analogous to D is well over 120 degrees and also just under 180 degrees.

[0035] In general terms, according to at least one embodiment, the torque transmission walls 624 (and preferably the drive surfaces 622 when the cutting insert 614 is mounted in the shaft 612) can each be positioned at a predetermined angle (e.g., angle D) with respect to a defining dimension of at least one centering wall section of the shaft 612 (which may be analogous to one or more centering walls, such as those shown in 432 in Fig. 4 and Fig. 5) be aligned. If the at least one centering wall section is substantially straight when viewed in a given single horizontal plane transverse to axis A, the defining dimension can be understood as a dimension parallel with respect to the at least one centering wall section. If, according to at least one alternative embodiment as described above, the at least one centering wall section is curved when viewed in a given single horizontal plane transverse to axis A (and, for example, along an arc substantially parallel to a circumference of the larger shaft 612), the defining dimension can be understood as a tangent to the curvature of the at least one centering wall section at a midpoint of the at least one centering wall section.

[0036] Fig. Figure 7A shows a side view of a cutting insert 714 according to at least one embodiment. As shown, a generally cylindrical centering pin 735 extends axially from a main head section (or head) 736. A recess (or notch) 738 is provided in the shank section 735 to receive an adjusting screw, in a manner that will be more fully appreciated below. Such a recess may be configured in any suitable way; as an illustrative and non-limiting example (and indeed as in Figure 7A), the following examples are shown: Fig. (as shown in Figure 7A) it could be defined by a relatively flat surface oriented parallel to a chord or secant defined by a cylindrical pin 735, and flanked on both axial sides by angled surfaces, one per side, which converge on the flat surface from an outer circumference defined by the pin 735. Fig. Figure 7A also shows the cutting edges 720, drive surfaces 722, and a cutting tip 717, which can be considered analogous to similar components described and illustrated elsewhere herein. In a different embodiment, two symmetrical notches / recesses 738 may be provided, arranged diametrically opposite each other with respect to the shank section 735.

[0037] Fig. Figure 7B shows a top view of the cutting insert 714 from Fig. 7A. As shown, the drive surfaces 722 can be used in a similar way to those in 622. Fig. The 6 shown should be aligned.

[0038] Fig. 7C shows an axial section through the line 7C-7C in Fig. 7B is shown. In particular, some feasible dimensional relationships for recess 738 are illustrated here.

[0039] Fig. Figure 7D shows a side view of a cutting insert 714 according to at least one different embodiment. Here, instead of the recess / notch 738 from the Fig. Figures 7A-7C show an annular groove 739 for receiving an adjusting screw. As shown, the annular groove 739 can be countersunk in the centering pin 735 over the entire circumference of the pin 735. The groove 739 can further be defined, essentially as shown, by an inner cylindrical surface (with a smaller diameter than the rest of the centering pin 735 itself) flanked on its two axial sides by frustoconical surfaces, one on each side, which converge at the inner cylindrical surface from an outer circumference defined by the pin 735.

[0040] Fig. Figure 8 shows essentially the same elevation as Fig. Figure 7A additionally shows an angled adjusting screw 840 according to at least one embodiment. As shown, the adjusting screw 840 can be inclined at an angle E with respect to the horizontal (i.e., in a plane transverse to the axis A) to engage in the recess 834 in a manner that will be better understood below. The adjusting screw 840 can, in turn, be screwed into a compatible channel to displace parallel to its own central longitudinal axis. For this purpose, it can be actuated at a rear section thereof (i.e., at the end section located away from the recess 838) by means of a wrench or other arrangement that can displace the adjusting screw 840 in a rotational direction (about its own central longitudinal axis) in order to displace the adjusting screw 840 via the aforementioned threaded engagement.

[0041] According to at least one embodiment, illustrated Fig. Figure 9A schematically shows, in an elevation cross-sectional view, a cutting insert 914 and an adjusting screw 940 in a starting position for assembly. In this illustration, the centering pin 935 (of the insert 914) encloses an annular groove 939 (e.g., similar to that at 739 in the view of...). Fig. (7D shown), it is understood that the following discussion also applies in the case of an intervention in a recess or notch, e.g. similar to that in 738 of Fig. 7A shown, may apply.

[0042] As in Fig. As shown in Figure 9A, the adjusting screw 940 can be arranged in a dedicated channel (or hole) 942 in such a way as to be moved back and forth within the channel / hole 942. As mentioned above, such movement can be facilitated by mutual thread engagement between the adjusting screw 940 and the channel / hole 942, but according to at least one derogatory embodiment, the adjusting screw 940 can be arranged to slide within the channel / hole 942. According to at least one other derogatory embodiment, the adjusting screw 940 and the channel / hole 942 can be configured such that part of the back-and-forth movement is effected by thread engagement and part of such movement by sliding displacement.

[0043] According to at least one embodiment, the adjusting screw 940 in turn includes a main shaft section 944 and a head section 946 with a bottleneck region 947 arranged between them. The head section can taper, as shown (e.g., via a frustoconical outer surface), generally in a direction toward the insert 914. A distal end of the adjusting screw 940 (i.e., an end arranged toward the insert 914 with respect to an axial direction of the adjusting screw 940) can also be defined by a flat circular end face 948.

[0044] According to at least one embodiment, the groove 939 can enclose a first angled surface 950 (towards a trailing end of the centering pin 935), a second angled surface 952 (towards a leading end of the centering pin 935), and an inner cylindrical wall 954 extending between them. As such, the first angled surface 950 can be dimensioned to engage, as shown, the end face 948 of the adjusting screw 940 (in the initial position for assembly). It should be understood and recognized that similarly configured and arranged surfaces can be provided in the case of a recess that does not extend completely around a circumference of the centering pin 935 (e.g., recess 738 in Fig. 7A). Furthermore, it is understood that, while the angled surfaces 950 / 952 and the cylindrical wall 954 are shown and described as a non-restrictive and illustrative example, variations thereof may be used. For example, the wall 954 need not necessarily be cylindrical; it may, for instance, be inclined with respect to axis A and could even assume two or more distinct sections along an axial dimension. The angled surfaces 950 / 952, in turn, may be angled differently than shown in Figure 7A. Fig. 9A shown, and could even run exactly perpendicular to axis A.

[0045] According to at least one differing embodiment, the adjusting screw 940 can be configured without a constricted neck region 947 such that it terminates at its distal end only via a chamfered outer surface that converges to a flat, circular end face. In such a variant, the "ejection" can be carried out by means of a wrench, as shown in 1070. Fig. 10 (and as described in more detail below). For clamping, the adjusting screw can be positioned at an angle E (as shown in Fig. 8 shown), so that either its end face sits on surface 950 or the chamfered / truncated conical outer surface of the adjusting screw sits on surface 950; in either case, this can generate an axial clamping force which still pushes the cutting insert 914 towards H1, as shown in Fig. 9B shown.

[0046] As shown, the shank includes a central hole 926 for receiving the centering pin 935 of the cutting insert 914. Preferably, the centering pin 935 has a precise sliding fit with respect to the central hole 926. As such, the lateral component of the clamping force generated by the adjusting screw 940 is supported by the wall of the hole 926, thereby preventing excessive displacement of the pin; it is understood that such excessive displacement could otherwise cause the insert 914 to lose its concentricity with the axis of rotation A and / or cause breakage of the pin 935. The combination of a precise fit between the pin 935 and the hole 926, in conjunction with the interference fit between the insert 914 and a pocket of the shank 912 (such as pocket 428 of [reference missing]) provides Fig. 4) ensures that the insert 914 is clamped in a correct position and remains stable in its position during operation. As such, it is understood that, according to at least one embodiment, the hole 926 and the pin 935 can assume a circular cross-section when viewed two-dimensionally (in a plane transverse to axis A) and a substantially cylindrical configuration when viewed three-dimensionally. According to at least one other embodiment, the hole 926 and the pin 935 can assume any of a variety of other possible two-dimensional cross-sectional shapes, e.g., an elongated (stadium) or an elliptical shape.

[0047] The central hole 926 can also include a bottom section (towards the trailing end of the shaft 912), or base 955. To help ensure that the pin 935 (and the cutting insert 914) is initially seated in a predetermined position for proper engagement with the front section 946 of the adjusting screw 940, a deformable element 956 can be provided between this bottom surface 957 and the base 955. Preferably, the deformable element 956 inclines the centering pin 935 upward (i.e., towards a leading end of the shaft 912). By way of illustration only, and not as a limiting example, the deformable element 956 can take the form of an O-shaped ring, a spring, or a ball plunger.According to a different embodiment, a similar or analogously deformable element - as an alternative to or in addition to element 956 - can be placed on the bottom of a bag, such as the bottom 430, which is in . Fig. 4 and Fig. 5 is shown; this alternative or additional element would then tilt a seat surface of an associated cutting insert upwards in an axial direction.

[0048] As in Fig. As shown in Figure 9A, the end face 948 of the adjusting screw 940 contacts the first angled surface 950 of the shaft 935 via an initial contact area, which is itself shown within the dotted circle 958. The manner of engagement between the adjusting screw 940 and the shaft 935 then changes in a way that will be better understood below.

[0049] According to at least one embodiment, illustrated Fig. 9B schematically shows the cutting insert and an adjusting screw of Fig. 9A, but in a “clamped” position. To achieve a “clamped” position, the adjusting screw 940 is moved within the channel 942 (e.g., by turning and the thread engagement mentioned above) in a direction G1 to cause the shank 935 (and thus the cutting insert 914) to move axially downwards (i.e., towards H1). This causes the entire cutting insert 914 to move axially downwards into a pocket of the shank 912 (e.g., pocket 428 in Fig. 4 and Fig. 5) to move, whereupon the centering walls of the pocket (e.g. the walls 432 in Fig. 4 and Fig. 5) deform elastically in a radial outward direction (with respect to axis A). This then promotes an interference fit of the insert 914 within the shaft 912 (as discussed above), so that the insert 914 is then secured within the shaft 912. Furthermore, when in the "clamped" position, the deformable element 956 is deformed in an axial direction of the insert 914, and the end face 948 of the adjusting screw 940 contacts the first angled surface 950 over a slightly larger area (e.g., as indicated within the dashed circle 960) than was the case in the first assembly position (see Fig. 9A, and dashed circle 958).

[0050] According to at least one embodiment, illustrated Fig. 9C schematically shows the cutting insert and an adjusting screw of Fig. 9A, but the insert is still in a "clamped" position and the adjusting screw is already positioned for ejection. As such, the "ejection" action occurs when the adjusting screw 940 undergoes a reverse sliding movement, as indicated by arrow G2, and then contacts (via an upper ejection surface 964 of the head section 946) the second angled surface 952 in a manner shown in the dotted circle 962. This then causes the centering pin 935 (and the cutting insert 914) to move axially in a "return" direction, as indicated by arrow H2. The insert is pushed out of the pocket and must overcome the frictional forces exerted by the pocket walls (due to the press fit).

[0051] According to at least one embodiment, the surfaces 952 and 964, which relate to Fig. 9A-9C, as described and illustrated, are preferably oriented in a horizontal direction, i.e., perpendicular to axis A. This facilitates an ejection force that is applied essentially in an axial direction (H2).

[0052] Preferably, the surfaces 948 and 950 can be oriented substantially parallel to each other to facilitate direct engagement by applying and distributing a clamping force, as well as mutual sliding displacement when moving between a starting position for assembly ( Fig. 9A) and a clamping position ( Fig. 9B). Furthermore, both surfaces can preferably be oriented in a direction transverse to the angle E, as in Fig. 8 shown. The angle formed by either one or both surfaces (948 and 950) with respect to the horizontal (i.e., in a plane perpendicular to axis A), and / or the angle E, as shown in Fig. 8 shown, can be determined in a manner deemed suitable on the basis of various factors, including but not limited to: available, required or desired physical dimensions of the adjusting screw 940 and / or the channel / hole 942; and a desired or required clamping force by adjusting screw 940, with its axial component acting in the direction of H1.

[0053] Available dimensions of adjusting screw 940 and / or channel / hole 942 can be determined, for example, by the dimensions of the pocket of the shaft 912 and / or its associated walls (e.g., such as those of pocket 428 and walls 432 in Fig. 4) be limited. Thus, in theory, while an angle E (as in Fig. 8 shown) ideally is 90 degrees to ensure a direct application of an axial clamping force (of the adjusting screw 940 on the insert 914), with possible angles of zero degrees formed by one of the two surfaces 948 / 950 with respect to the horizontal (i.e. in a plane perpendicular to the axis A), in reality forming different physical boundary conditions of an angle E (as in Fig. 8 shown), of no greater than about 70 to about 80 degrees.

[0054] However, it should be noted that one or more alternative embodiments may well provide a provision for the use of an axial clamping force which may be almost parallel in one direction with respect to axis A; this could be achieved, for example, by means of a concave or angled end face of the adjusting screw 940 or by means of a physical extension of the adjusting screw 940 (or component which is physically attached) projecting outwards from the adjusting screw 940, which itself is oriented in a horizontal direction (i.e. perpendicular to axis A).

[0055] Fig. Figure 10 provides a top view of a shaft 1012 according to at least one differing embodiment, including a wrench 1070 for moving a cutting insert. Here, the centering walls 1032 of the pocket 1028 can be arranged, configured, and aligned in a similar manner to the walls 432 that are in Fig. 4 and Fig. 5 will be shown. Additionally, another variant can be shown in relation to the main forms of execution, which relate to Fig. 4 and Fig. As considered in Figure 5, the torque transmission walls 1024 themselves are oriented at a similar vertical angle to the centering walls 1032. (Here it is understood that the torque transmission walls 1024 and centering walls 1032 are both inclined with respect to the central longitudinal axis and, by extension, in a plane transverse to the central longitudinal axis.) In a manner that will be better understood below, a dedicated wrench 1070 can be used to effect a type of clamping and ejecting action, as described above, and in an analogous form with respect to the examples in Figure 5. Fig. 9B and Fig. 9C.

[0056] Fig. Figure 11A shows a front elevation of a shank and a cutting insert in a clamping position, according to at least one differing embodiment. As shown, the cutting tool 1110 with shank 1112 and cutting insert 1114 can generally exhibit similarities to analogous components shown and described in relation to other embodiments discussed and illustrated herein. However, analogous to the one discussed above, Fig. 10, a radial hole 1172 for the inclusion of a wrench may also be included, the function of which can be better understood from the following discussion.

[0057] As such, it represents Fig. 11B provides an axial section that passes through the line 11B-11B in Fig. 11A goes. As shown, the radial hole 1172 can be considered a blind hole, since it terminates in the central hole 1126 of the shaft 1112. As with other embodiments discussed and illustrated herein, the centering walls 1132 of the shaft 1112 can be dimensioned to receive the cutting insert 1114 via an interference fit. As such, a wrench (such as the one shown at 1070 in Fig. 10 shown) selectively removable and usable in relation to the radial hole 1172; the orientation and function of a wrench therein will be better understood from the description below.

[0058] At the same time, an adjusting screw 1176 can preferably be provided, oriented in a horizontal direction with respect to the cutting insert 1114, or in a direction transverse to the central axis A. The adjusting screw 1176 can move back and forth within its own channel (which extends radially with respect to the axis A) via a threaded engagement between the two. To actuate a translational movement of the adjusting screw 1176 within its own channel, a wrench, such as one shown at 1070, can be used. Fig. As shown in Figure 10, the wrench can be used to rotate the adjusting screw 1176 about its own axis of rotation. For this purpose, a protrusion of the wrench can be inserted into a compatible recess 1178 located at a rear end of the adjusting screw 1176 (i.e., at an end of the adjusting screw located away from axis A).

[0059] It goes without saying that Fig. Figure 11B illustrates the cutting insert 1114 in a “clamped” position, analogous to Fig. 9B. As will be more clearly seen below, an “ejection” is achieved by turning a wrench (such as the one at 1070 in Fig. 10) in the radial hole 1172 is facilitated, with an end bulge of the wrench contacting a bottom of the centering pin 1135 and forcing it to move upwards (i.e., towards the end of the leading edge of the cutting tool 1110). Also, adjusting screw 1176 should be moved away from the central axis A to "eject" the cutting tool, allowing unimpeded axial upward movement of the cutting insert 1114.

[0060] Fig. Figure 12A shows a side view of a shaft and cutting insert according to at least one different embodiment similar to that shown in Fig. 11A, however with the wrench 1270 inserted and in a position set for “ejection” or disassembly. The cutting tool 1210 with shaft 1212 and cutting insert 1214 may exhibit general similarities to analogous components shown and described in relation to other embodiments discussed and illustrated herein, while the function of the wrench 1270 will be better understood from the following discussion.

[0061] Fig. Figure 12B shows a rear elevation of the shaft and cutting insert, which is in Fig. 12A is shown. Accordingly, an additional adjusting screw 1276 with a recess 1278 is shown here, which is essentially similar to the analogous component in Fig. It's 11B.

[0062] Fig. 12C shows an axial section defined by the line 12C-12C in Fig. 12B goes. As shown, the wrench 1270 is arranged in the radial hole 1272; this in turn is designed as a blind hole that terminates in the central hole 1226 of the shaft 1212. The centering walls 1232 of the shaft 1212 can also be dimensioned to receive the cutting insert 1214 via an interference fit. The wrench 1270 is itself selectively removable and insertable with respect to the radial hole 1272 and includes an end projection 1274 which can be dimensioned to fit into the space below a bottom section (i.e., a trailing end section) of the centering pin 1235 of the insert 1214, as shown in Fig. Shown as 11A.

[0063] Also shown is the adjusting screw 1276, which is oriented in a horizontal direction with respect to the cutting insert 1214, or in a direction transverse to the central axis A. The adjusting screw 1276 can move back and forth within its own channel (which extends radially with respect to axis A) via a threaded engagement between the two. To actuate a translational movement of the adjusting screw 1276 within its own channel, the wrench 1270 can be used to rotate the adjusting screw 1276 about its own axis of rotation. For this purpose, the protrusion 1274 of the wrench 1270 can be inserted into the compatible recess 1278, which is located at a rear end of the adjusting screw 1276 (i.e., at an end of the adjusting screw that is oriented away from axis A).

[0064] It goes without saying that Fig. 12C actually illustrates the cutting insert 1214 in a state ready for “ejection” or disassembly, analogous to Fig. 9C. Thus, ejection is facilitated here simply by turning the wrench 1270 in its radial hole 1272, with the end bulge 1274 contacting a bottom of the centering pin 1235 and forcing it to move upwards (i.e., towards the end of the leading edge of the cutting tool 1210), thereby releasing the insert 1214 from the centering walls 1232 of the pocket (and thus, from the pocket itself). To facilitate ejection, the adjusting screw 1276 (as shown) can also be moved away from the central axis A to allow unimpeded axial upward movement of the cutting insert 1214.

[0065] Fig. Figure 12D shows an axial section defined by the line 12D-12D in Fig. 12A goes. As shown, the protrusion 1274 of the wrench 1270 can be shaped in its cross-section like a stadium (geometric shape). A curved recess 1280 can therefore be provided to accommodate the rotational movement of the protrusion 1274, with both components being shaped compatiblely to allow this movement. The recess 1280, in turn, can be considered an extension of the in Fig. The radial hole 1272 shown in Figure 12A can be understood as serving as a support to resist the force generated by the interaction between the bulge 1274 and the bottom section of the pin 1235.

Claims

[1] Rotating cutting tool comprising: a shaft (12); and a replaceable cutting tip (14); wherein the shaft (12) includes a pocket (428) which receives the replaceable cutting tip (14) via a press fit; this pocket (428) comprises two centering wall portions (432) which, when viewed along a central longitudinal axis (A) of the shaft (12), are aligned at a first angle (B) to each other, the first angle (B) being greater than zero; and a set screw (840) mounted in the shaft (12) and oriented at a second angle (E) to a plane transverse to the central longitudinal axis (A) for axially displacing the replaceable cutting tip (14) from a home position to a clamping position, and for axially displacing the replaceable cutting tip (14) from the clamping position to an ejection position, wherein, in order to effect a displacement of the replaceable cutting insert (14) between the starting position and the clamping position: a first surface (948) of the adjusting screw (840) contacts a second surface (950) of the replaceable cutting tip (14) via a first contact surface (958); the adjusting screw (840) moves in a first direction; and the replaceable cutting tip (14) then moves axially from the starting position to the clamping position in which the adjusting screw (840) contacts the replaceable cutting tip (14) via a second contact surface (960) which is larger than the first contact surface (958), wherein, in order to effect a displacement of the replaceable cutting tip (14) between the clamping position and the ejection position: a third surface (964) on the set screw (840) contacts a fourth surface (952) on the replaceable cutting tip (14) via a third contact surface (962); the adjusting screw (840) moves in a second direction opposite to the first direction; and the replaceable cutting tip (14) then moves axially from the clamping position to the ejection position and wherein frictional forces from the press fit are overcome when the replaceable cutting tip (14) is moved from the clamping position to the ejection position. [2] A rotary cutting tool according to claim 1, wherein: a holding element (944) comprises the adjusting screw (840) mounted in the shaft (12) and aligned at a second angle (E) to a plane transverse to the central longitudinal axis (A); wherein the adjusting screw (840) undergoes a sliding movement parallel to the second angle (E). [3] A rotary cutting tool according to claim 2, wherein the second angle (E) is less than 90 degrees. [4] A rotary cutting tool according to claim 3, wherein the second angle (E) is less than or equal to 70 degrees. [5] A rotary cutting tool according to claim 2, wherein the replaceable cutting tip (14) includes a recessed portion (738) contacted by the set screw (840) in the clamping position. [6] The rotary cutting tool of claim 1, wherein at least one of the first and second surfaces (948, 950) is oriented at an angle greater than or equal to about 10 degrees with respect to a plane transverse to the central longitudinal axis (A). [7] The rotary cutting tool of claim 1, wherein at least one of the third and fourth surfaces (952, 964) is oriented at an angle of approximately zero degrees with respect to a plane transverse to the central longitudinal axis (A). [8] A rotary cutting tool according to claim 2, wherein the second angle (E) is approximately zero degrees. [9] Rotating cutting tool comprising: a shaft (12); and a replaceable cutting tip (14); wherein the shaft (12) includes a pocket (428) which receives the replaceable cutting tip (14) via a press fit; this pocket (428) comprises two centering wall sections (432) which, when viewed along a central longitudinal axis (A) of the shaft (12), are aligned at a first angle (B) to each other, the first angle (B) being greater than zero and an adjusting screw (840) mounted in the shaft (12) and oriented at a second angle (E) to a plane transverse to the central longitudinal axis (A) for axially displacing the replaceable cutting tip (14) from a starting position to a clamping position, wherein the two centering wall sections (432) deform to receive the replaceable cutting tip (14) via the press fit when the replaceable cutting tip (14) is moved from the home position to the clamping position, a channel (942) disposed in the shaft (12); and a wrench (1070) insertable into the channel (942) for sliding and rotating movements within the channel; wherein the wrench (1070), upon rotation about a longitudinal axis of the wrench (1070) in the channel (942), causes a displacement of the replaceable cutting tip (14) between the clamping position and the ejection position, wherein the wrench (1070) comprises a bulge (1274) which, upon rotation of the wrench (1070) in the channel (942), displaces the replaceable cutting tip (14) between the clamping position and the ejection position, and wherein the set screw (840) includes a recess (1278) which receives the bulge (1274) of the wrench (1070) to enable rotational movement of the set screw (840) driven by the wrench (1070). [10] A rotary cutting tool according to claim 9, wherein the channel (942) includes a trough (1280) which receives the bulge (1274) and enables rotational displacement of the bulge (1274) about the longitudinal axis of the wrench (1070). [11] A rotary cutting tool according to claim 1, wherein the first angle (B) is between 3 degrees and 6 degrees. [12] A rotary cutting tool according to claim 1, wherein: the shaft (12) includes a pair of torque transmitting walls (1024) for rotating the replaceable cutting tip (14) about the central longitudinal axis (A) of the shaft (12); at least one of the torque transmitting walls (1024) is oriented at a third angle with respect to a defining dimension of at least one of the centering wall portions (432), the third angle being between about 75 degrees and about 120 degrees. [13] The rotary cutting tool of claim 12, wherein the third angle is between about 85 degrees and about 100 degrees. [14] A rotating cutting tool according to claim 12, wherein the torque transmitting walls (1024) are oriented at a non-zero angle with respect to a plane transverse to the central longitudinal axis (A) of the shank (12). [15] A rotating cutting tool according to claim 12, wherein: the replaceable cutting tip (14) includes a pair of drive surfaces (722) each contacting a corresponding one of the torque transmitting walls (1024) when the replaceable cutting tip (14) is in the clamping position; wherein the drive surfaces (722) are each oriented at the third angle with respect to the outer circular path of the shaft (12). [16] Shank for a rotating cutting tool, the shank (12) comprising: a pocket (428) receiving a replaceable cutting tip (14) via an interference fit, the pocket (428) comprising two centering wall portions (432) which, when viewed along a central longitudinal axis (A) of the shank (12), are oriented at a non-zero angle with respect to each other; a set screw (840) mounted in the shaft (12) and oriented at a second angle (E) to a plane transverse to the central longitudinal axis (A) for axially displacing the replaceable cutting tip (14) from a home position to a clamping position, and for axially displacing the replaceable cutting tip (14) from the clamping position to an ejection position, a pair of torque transmission walls (1024) for rotatably driving the replaceable cutting tip (14) about the central longitudinal axis (A) of the shaft (12); wherein said torque transmitting walls (1024) are each oriented at a predetermined angle with respect to a defining dimension of at least one of said centering wall portions (432), said third angle being between about 75 degrees and about 120 degrees; a channel (942) disposed in the shaft (12); and a wrench (1070) insertable into the channel (942) for sliding and rotating movements within the channel; wherein the wrench (1070), upon rotation about a longitudinal axis of the wrench (1070) in the channel (942), causes a displacement of the replaceable cutting tip (14) between the clamping position and the ejection position, wherein the wrench (1070) comprises a bulge (1274) which, upon rotation of the wrench (1070) in the channel (942), displaces the replaceable cutting tip (14) between the clamping position and the ejection position, and wherein the set screw (840) includes a recess (1278) which receives the bulge (1274) of the wrench (1070) to enable rotational movement of the set screw (840) driven by the wrench (1070).

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